Ext.onReady(function(){
	var data = [
		['value1', 'text1'],
		['value2', 'text2'],
		['value3', 'text3'],
		['value4', 'text4']
	]
	var store = new Ext.data.SimpleStore({
		fields:['value','text'],
		data:data
	});
	
	var combox = new Ext.form.ComboBox({
		store:store,
		emptyText:'请选择...',
		mode:'local',
		triggerAction:'query',
		valueField:'value',
		displayField:'text',
		renderTo:Ext.getBody()
	})
})